2011 general election Loh formally entered politics during the
2011 general election when she contested as a SPP candidate in
Potong Pasir SMC. Loh ultimately lost to the
PAP candidate
Sitoh Yih Pin by a narrow margin of 114 votes (0.72%), garnering 49.64% of the vote against Sitoh's 50.36%. Despite her electoral defeat as the best performing defeated candidate, Loh qualified for a seat in the
12th Parliament as a
Non-constituency Member of Parliament (NCMP) by virtue of being one of the "best losers" in an election in which fewer than nine opposition Members of Parliament had been elected. She accepted the NCMP seat on 12 May 2011 and served in the 12th Parliament from 12 May 2011 to 23 August 2015.
2015 general election During the
2015 general election, Loh contested under the SPP banner in Potong Pasir SMC, but lost to the PAP's
Sitoh Yih Pin again, garnering 33.61% of the vote against Sitoh's 66.39%. Since there were six opposition Members of Parliament who had been elected in the 2015 general election, only three NCMP seats would be offered. Loh's electoral result in Potong Pasir SMC was lower than that of the other opposition candidates so she was not offered a NCMP seat in the
13th Parliament. due to Chiam's declining health, which had led to him stepping down from his position as the SPP's secretary-general on 16 October 2019. Loh remains a member of the SPP's central executive committee after stepping down as its chairwoman in 2019. ==Charity work==